In fact, 316 and 304 stainless steel with austenitic stainless steel, have good rust resistance, corrosion resistance, (after surface polishing)316 stainless steel and 304 stainless steel, widely used in food grade equipment, machinery, appliances, such as: food and drug processing equipment, medical equipment, vacuum cups, children's tableware and so on.
However, 304 stainless steel and 316 stainless steel are different in high temperature mechanical properties, corrosion resistance of special media. When the technical documents require the use of 316 stainless steel, 304 stainless steel should not be used instead.
Characteristics of 304 and 316 stainless steels
304 stainless steel is a very widely used stainless steel model, its high temperature resistance of 800 degrees, corrosion resistance, easy processing, high toughness characteristics, used in industrial manufacturing, architectural decoration, food and medical and other industries.304 stainless steel is a general stainless steel, widely used in the production of good comprehensive performance requirements (corrosion resistance, molding) equipment and parts.316(L) stainless steel is the standard grade of stainless steel in the United States. The "L "in 316L, which means" LOW "in English, indicates that 316L is the material with lower carbon content in the same series.
Compared with 304, 316(L) stainless steel greatly improves the resistance to chemical corrosion, and has higher resistance to high temperature creep, stress fracture and tensile strength than other steels.
316(L) stainless steel is more resistant to atmospheric and similar mild corrosion than 304.The corrosion resistance of 316(L) stainless steel in sulfuric acid solution is much higher than other Cr-Ni type stainless steel (such as 304, 321, etc.).316(L) stainless steel can withstand up to 5% of this acid solution at temperatures of 49°C. At temperatures of 38°C, 316(L) stainless steel has excellent corrosion resistance to higher concentrations of solutions.(Note: 316(L) stainless steel is more resistant to corrosion than other types where sulfur-containing gas condenses. However, in this case, the concentration of acid has a significant effect on the rate of erosion, which should be carefully determined.)
Stainless Steel Mesh 316 and 304 which good, how to choose?
Case 1: when the corrosion resistance is not high, 304 stainless steel is better, because the unit price of 304 stainless steel is lower than that of 316 stainless steel.
Case 2: when the use of scenarios for chloride ion corrosion resistance, heat resistance has higher requirements, stainless steel mesh 316 is better. Because 316(L) stainless steel contains molybdenum (Mo) element, Si formed carbide is very stable, can prevent the austenite heating grain growth, reduce the steel's overheating sensitivity. In addition, molybdenum can make the passivation film more compact and firm, so as to effectively improve the corrosion resistance of stainless steel chloride ion (Cl -).
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